is_manufactured_by has function has role has component immunizes recipient Cervidae preventive vaccine function prophylactic vaccine licensed vaccine role licensed deer vaccine contraceptive vaccine surface antigens from the zona pellucida SpayVac vaccine Crude ZPA preparation; supplied to research groups only Oliver He vaccine SpayVac no longer available A contraceptive vaccine that has proven highly effective in deer and can be used to control populations. http://terramar.bc.ca/ ImmunoVaccine Technologies, Canada